Finding the Fourth Proportional to 1,113.40, 1,660.26 and 1,103.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,113.40 : 1,660.26 = 1,103.50 : x
2. Step 2: Convert to fraction form
   1,113.40/1,660.26 = 1,103.50/x
3. Step 3: Cross multiply
   1,113.40x = 1,660.26 × 1,103.50
4. Step 4: Simplify right side
   1,113.40x = 1,832,096.91
5. Step 5: Solve for x
   x = 1,832,096.91/1,113.40
6. Step 6: Final answer
   x = 1,645.50